Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

66 Buick Q-Jet

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Rhett:
I get what you mean, the ICR is huge and it's jetted big..but it doesnt feel rich, it feels lean - in the sense it doesnt stumble or miss, there's just a slight "hole" in throttle range where nothing happens, and then it picks up when the cruise comes in. I know WOT and idle mixtures could cover any richness indicators, but no fouling, pipe soot or smoke throughout throttle range..

Could a temporary rich condition cause a "hole" like that?

Cliff Ruggles:
Rich conditions usually don't give a lot of negative symptoms, just excessive fuel consumption.

The float level and fuel pressure play a big role here as well.  The early carburetors have the worst fuel inlet design and float hinge pin location. 

We avoid them here for any sort of performance use.  The fuel level in the bowl may be a tad low, and why you are having to put so much fuel to it to get good results.

You mentioned a .145 fuel inlet, most of the conversion kits are .110".  .250" is a "low" float setting for that carburetor, might want to move it up to 3/16" and see if it helps some?........Cliff

Rhett:
Thanks for the feedback - I'll bump the float up and see if it helps

I got the .145 needle/seat from you to cover a fuel deliver issue I was having - would fall on it's face just after the shift. Maybe I didnt bring the float high enough.

I know these are the least desirable Q-Jets, but it's really a pretty good running carb, good throttle response and secondary transition, makes good power and idles well... just has that hole.

Rhett:
Set the float at 1/8 - seems to have done the trick..


Thanks for your help.

Rhett

Cliff Ruggles:
1/8 to 3/16" is usually what it takes to get those working correctly....good news!.....Cliff

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